After updating from 2019.3.0f5 (alpha) version the follow error stack is displaying - reimporting packages and recompiling does not solve anything.
Packages\com.unity.vectorgraphics\Runtime\VectorSprite.cs(274,35): error CS1061: 'Sprite' does not contain a definition for 'GetVertexAttribute' and no accessible extension method 'GetVertexAttribute' accepting a first argument of type 'Sprite' could be found (are you missing a using directive or an assembly reference?)
I have finally found the solution, which is to upgrade vectorgraphics to 2.0.0-preview.12.
Only tested with 2020.1.0b4 though, not 100% it’s working for Unity 2019.